[kompare] [Bug 475160] New: kompare will Not compare any files

[LandisTwo]

https://bugs.kde.org/show_bug.cgi?id=475160

            Bug ID: 475160
           Summary: kompare will Not compare any files
    Classification: Applications
           Product: kompare
           Version: 4.1.21123
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: parser
          Assignee: kompare-devel at kde.org
          Reporter: landis at landistwo.com
  Target Milestone: ---

Created attachment 162043
  --> https://bugs.kde.org/attachment.cgi?id=162043&action=edit
one of 2 errors i get, described above

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***


STEPS TO REPRODUCE
1. select 2 text (.txt) files, context menu, compare OR start kompare select 2
text files
2. click compare
3. fail

OBSERVED RESULT
no matter the way I select 2 text files, kompare fails with error:
1: "No models or no differences, this file file://path/to/file.txt is not a
valid diff file."
or
2: "Unknown options: U, H, d, r. - see kdiff3 --help for supported options"
or
3: "could not parse diff output"

EXPECTED RESULT
compare the files.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: openSuSE 15.4/4.1.21123
(available in About System)
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
*** KDiff3 works perfectly, when launch by itself without kompare

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